133306861 has 2 divisors, whose sum is σ = 133306862. Its totient is φ = 133306860.

The previous prime is 133306813. The next prime is 133306871. The reversal of 133306861 is 168603331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131537961 + 1768900 = 11469^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 133306861 - 2¹¹ = 133304813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133306801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66653430 + 66653431.

It is an arithmetic number, because the mean of its divisors is an integer number (66653431).

Almost surely, 2^133306861 is an apocalyptic number.

It is an amenable number.

133306861 is a deficient number, since it is larger than the sum of its proper divisors (1).

133306861 is an equidigital number, since it uses as much as digits as its factorization.

133306861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 133306861 is about 11545.8590412321. The cubic root of 133306861 is about 510.8391426933.

The spelling of 133306861 in words is "one hundred thirty-three million, three hundred six thousand, eight hundred sixty-one".